Manual Slide AC has no 1 -4 fan speed

jhenry999

Original poster
Member
Jun 28, 2015
27
Is there an electrical wizard reading this? Just bought 04 Envoy as is 165K miles. AC fan Speed 5 worked intermittently on AC , 1 - 4 don't at all. Bad HARNESS into RESISTOR MODULE replaced which corrected intermittent problem. Then replaced RESISTOR MODULE. Still no 1 -4. Then replaced SPEED CONTROL MODULE. Still no 1 - 4. Yes, both front and rear fuse block fuses are working...they have to be good to make speed 5 work. One Clue: when switching out of speed 5 to one of the 1 - 4 speeds, speed 5 goes off and 2 warning lights appear on dash: SERVICE 4WD...and ABS.
 

Sparky

Member
Dec 4, 2011
12,927
Sounds like you've got some sort of wiring chafing going on that is causing power from the lower speeds to feed into another circuit. Oh this could be fun.
 
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djthumper

Administrator
Nov 20, 2011
14,956
North Las Vegas
re check your resistor. Did you have to cut wires and re splice it back together? If you crimped them check them again.
 

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